¶ÔÊýÕý̬·Ö²¼·½²îÍƵ¼
¶ÔÊýÕý̬·Ö²¼µÄÆÚÍûºÍ·½²îÈçºÎÍƵ¼?
¾ÍÊDZ©Á¦»ý·Ö¾Í¿ÉÒÔÁË£¬µ«ÊÇÒª×öÒ»¸ö»»Ôª£¬°Ñln(x)»»³Éx¡£Õý̬·Ö²¼£¨Normal distribution£©£¬Ò²³Æ¡°³£...
¶ÔÊýÕý̬·Ö²¼µÄÆÚÍûºÍ·½²îÔõôÍƵ¼?
xn£ý·þ´Ó¶ÔÊýÕý̬·Ö²¼£¬ÄÇôËüµÄÊýѧÆÚÍûΪ£ºE=(lnx1+lnx2+...+lnxn)/n£» ËüµÄ±ê×¼²îΪ£º¦Ò=¡Ì{¦²(i£º1¡ún) [ln...
¶ÔÊýÕý̬·Ö²¼µÄÆÚÍûºÍ·½²îÈçºÎÍƵ¼? - ľͷ µÄ»Ø´ð...
xµÄÈ¡Öµ·¶Î§x>0,\\ E(X)=\int_{0}^{+\infty}{x f(x)}dx=\int_{0}^{+\infty}{\...
¶ÔÊýÕý̬·Ö²¼ÔõôÇó¾ùÖµ,·½²î?
´Ó¶øxµÄ¸ÅÂÊÃܶȺ¯Êý:fx(x)=[¦Õ(lnx)]¡ä=1/x¦Õ(lnx)ËùÒÔ ·½²î= ÎÒÕâÊÇ»¹ÍƵ¼ÁËÆÚÍûµÄ¹ý³Ì£¬Æä...
ÇëÎʹÉƱ¼Û¸ñ·þ´Ó¶ÔÊýÕý̬·Ö²¼µÄ¾ùÖµºÍ·½²îÊÇÔõôÍƵ¼...
¶ÔÓÚÒ»¸ö·þ´Ó¶ÔÊýÕý̬·Ö²¼µÄËæ»ú±äÁ¿£¬XlnN(m,v2)Ò²¼´lnXN(m,v2)£¬ËüµÄÆÚÍûºÍ·½²î¾ÍµÈÓÚE...
ÍƵ¼¶ÔÊýÕý̬·Ö²¼ÊýѧÆÚÍûµÄ»ý·Ö¹ý³Ì - °Ù¶È¾Ñé
ÉèÕý̬·Ö²¼¸ÅÂÊÃܶȺ¯ÊýÊÇf(x)=[1/(¡Ì2¦Ð)t]*e^[-(x-u)^2/2(t^2)]£¬¾ÍÊǾùÖµÊÇu,·½²î...
ÇóÕý̬·Ö²¼µÄÊýѧÆÚÍûºÍ·½²îµÄÍƵ¼¹ý³Ì
ÉèÕý̬·Ö²¼¸ÅÂÊÃܶȺ¯ÊýÊÇf(x)=[1/(¡Ì2¦Ð)t]*e^[-(x-u)^2/2(t^2)]Æäʵ¾ÍÊǾùÖµÊÇu£¬·½²îÊÇt^2£¬°Ù¶È²»Ì«ºÃ´ò...
Õý̬·Ö²¼µÄ·½²îÔõôÇó?
2exp((x¦Ì)22¦Ò2)dx=2¦Ð¦Ò32¦Ð¦Ò=¦Ò2 Õý̬·Ö²¼µÄ·½²î¾ÍÊÇpdfÀïµÄ²ÎÊý¦Ò2 ...
Õý̬·Ö²¼ÔõôÇóÆÚÍûºÍ·½²î
X N(¦Ì,¦Ò²)ÄÇôE(X²) = ¦Ò² + ¦Ì²D(X²) = ¡Ò (¡Þ,-¡Þ...
Õý̬·Ö²¼·½²î¹«Ê½ÔõôÇó?
µÚÒ»²ÎÊý¦ÌÊÇ·þ´ÓÕý̬·Ö²¼µÄËæ»ú±äÁ¿µÄ¾ùÖµ£¬µÚ¶þ¸ö²ÎÊý¦Ò2ÊÇ´ËËæ»ú±äÁ¿µÄ·½²î£¬